Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-01-07
1997-12-02
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, G11B 700
Patent
active
056943806
ABSTRACT:
A disc reproduction apparatus, configured so that a voltage-controlled oscillator is used as a means of giving a reference frequency to an analog phase-locked loop circuit, a control voltage based on a speed error of the rotational speed of a spindle with respect to the reference speed is given to this voltage-controlled oscillator by a rotational speed counting circuit, and a reference clock is produced in the analog phase-locked loop circuit based on the oscillation frequency given by this voltage-controlled oscillator and, at the same time, the reproduction clock PLLCK is produced by the digital phase-locked loop circuit based on this reference clock, whereby the operation becomes stable with respect to rotational outer disturbances and high speed access is enabled.
REFERENCES:
patent: 4575835 (1986-03-01), Nishikawa et al.
patent: 5170386 (1992-12-01), Tateishi
patent: 5265081 (1993-11-01), Shinizume et al.
patent: 5432766 (1995-07-01), Ando et al.
patent: 5535183 (1996-07-01), Miura et al.
patent: 5574710 (1996-11-01), Kimura et al.
Akita Mamoru
Nakamura Shinobu
Shimizume Kazutoshi
Kananen Ronald P.
Sony Corporation
Tran Thang V.
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